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To visualize it.
It would look like the upper half of a toroid (upper half of a donut).
The y=x-x^2 is the upper profile of the shape.
The y=0 is the lower (planar) surface of the shape.
x = 2 defines the center of the hole.
Use the shell method and add up the multiple cylindrical integrated 'shells'. Which will constitute the shape.
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